Basic Relationships of Well Log Interpretation

1 Basic Relationships of Well Log InterpretationINTRODUCTIONThis chapter provides a general introduction to welllogging principles and methods that will be usedthroughout the book. Succeeding chapters (2 through6) introduce the reader to specific log types. The textdiscusses how different log types measure variousproperties in the wellbore and surrounding formations,what factors affect these measurements, where on astandard log display a particular curve is recorded, andhow interpreted information is obtained from the logsusing both charts and mathematical formulas. Unlikemany other logging texts, the logging tools aregrouped according to their primary Interpretation tar-get, rather than their underlying measurement potential (SP) and gamma ray logs arediscussed first, as their primary use is correlation andtheir primary interpretive target is gross lithology (thedistinction between reservoir and nonreservoir).

Rock properties or characteristics that affect log-ging measurements are: porosity, lithology, mineralo-gy, permeability, and water saturation. Additionally, the resistivity of the rock is important because it is directly measured and is an essential part in the inter-pretation process. It is essential that the reader under-

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  Properties, Rocks, Rock properties

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